TIDMSIA 
 
RNS Number : 8901C 
Soco International PLC 
23 November 2009 
 

SOCO International plc 
("SOCO" or the "Company") 
 
 
 
 
SUCCESSFUL TEST OF THE VIODO 4 WELL ON MARINE XI 
 
 
The Viodo Marine 4 vertical appraisal well ("VIM-4") located in the Marine XI 
Block offshore the Republic of Congo (Brazzaville) has tested at a combined 
maximum flow rate of approximately 2,600 barrels of oil per day ("BOPD") and 7.0 
million standard cubic feet of gas per day ("MMSCFD") following two drill stem 
tests ("DSTs"). 
 
 
In the first drill stem test from the deeper Carbonate section between 2,240 to 
2,273 metres, the well flowed at initial post-acid rates of approximately 2,600 
BOPD and 2.5 million MMSCFD on a 3/4 inch choke. Flow rates stabilized at 
approximately 1,100 BOPD on a 1/2 inch choke after an approximate seven hour 
flow period.  A test of the upper Carbonate section, between 2,205 and 2,230 
metres, flowed at post-acid rates of approximately 4.5 MMSCFD. 
 
 
The objectives of the well are to further delineate the field, gather data that 
would allow the 3D seismic to be used to map the distribution of reservoir 
quality limestone and to test the effectiveness of a completion strategy that 
could be applied to high angle development wells. 
 
The results of the well and the reprocessed seismic will now be incorporated 
into a 3D model that will be used as a tool to assess the commerciality of the 
accumulation. 
 
 
As planned the well will be plugged and abandoned and the jack-up drilling rig 
Pride Cabinda will be released. 
 
 
Ed Story, President and Chief Executive of SOCO, commented: 
 
 
"We are pleased to have a successful well under our belts at the early stages of 
our ambitious drilling programme.  The results of this well provide greater 
confidence over the Viodo Field's reserve range and will be invaluable in 
planning the field development.  Moreover, the Company successfully completed 
the initial drilling campaign in a new part of the world for us. The technical 
lessons learnt should be invaluable in planning the wells for other larger 
targets on the block." 
 
 
 
 
23 November 2009 
 
 
 
 
ENQUIRIES: 
 
 
SOCO International plc 
Antony Maris, Vice President - Operations and Production 
Tel: 020 7747 2000 
 
 
Pelham Public Relations 
James Henderson Tel: 020 7337 1500 
Mark Antelme Tel: 020 7337 1505 
 
 
NOTES TO EDITORS: 
 
 
SOCO is an international oil and gas exploration and production company, 
headquartered in London, traded on the London Stock Exchange and a constituent 
of the FTSE 250 Index. The Company has interests in Vietnam, Thailand, the 
Republic of Congo (Brazzaville), the Democratic Republic of Congo (Kinshasa) and 
Angola, with production operations in Vietnam and Thailand. 
 
 
SOCO holds its interests in the Republic of Congo, all offshore in the 
Lower Congo Basin, through its 85% owned subsidiary, SOCO Exploration and 
Production Congo SA (SOCO EPC) which is the designated operator of the two 
Blocks. 
 
This information is provided by RNS 
            The company news service from the London Stock Exchange 
   END 
 
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